Voltage imbalance limit?
Voltage imbalance limit?
(OP)
Hello, does anybody know if there is a requirement in North America that sets the voltage unbalance limit for a utility supply?
Thanks in advance!
Thanks in advance!
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RE: Voltage imbalance limit?
That tells me that each utility may have their own standards. At the most each state's DPUC may have something but not sure.
Try asking your local utility company.
Rafiq Bulsara
http://www.srengineersct.com
RE: Voltage imbalance limit?
RE: Voltage imbalance limit?
RE: Voltage imbalance limit?
David Castor
www.cvoes.com
RE: Voltage imbalance limit?
As dpc allowed, you have to define your percentage calculation too. There's a NEMA standard somewhere for that on motor loads... I don't know what it is, though. One of the more reputable manufacturers of motor voltage monitors labels the setpoint dial for unbalance trip NEMA %, and you choose something between 2 and 8.
Good on ya,
Goober Dave
RE: Voltage imbalance limit?
David Castor
www.cvoes.com
RE: Voltage imbalance limit?
You are 100% correct, IEEE/ANSI defines in the same way.
RE: Voltage imbalance limit?
The definition of voltage unbalance is the ratio of negative sequence voltage V2 to the positive sequence voltage V1 and is called Negative Sequence Voltage Unbalanced Factor. This definition is adopted by IEC 60034-26 and is also known as the Voltage Unbalance Factor (VUF) or IEC definition.
RE: Voltage imbalance limit?
See 'Motor Heating' http://www.eng-tips.com/viewthread.cfm?qid=209235; in particular elelctricpete's spreadsheet at http://h
RE: Voltage imbalance limit?
pwrtran,
Which IEEE standard suggested 2% limit?
RE: Voltage imbalance limit?
IEEE Std1159-1995 Clause 5.5.4 and also Table 2